Dental flask



(No Model.) v

T. w. BROWNE.

DENTAL FLASK.

No. 255,098. Patented Mar. 21,1882.

nedmw r UNITED STATES PATENT OFFICE. V

THOMAS W. BROWNE, OF DELHI, NEW YORK.

DENTAL FLAS K.

SPECIFICATION forming part of Letters Patent No. 255,098, dated March 21, 1882.

Application filed April 8, 1881.

To all whom it may concern:

Be it known that I, THOMAS W. BROWNE, of the village ofDelhi, in the county of Delaware and State of New York, have invented a new and usefullmprovement in Dental Flasks, which improvement is fully setforth in the following specification, reference being bad to the accompanying drawings.

The object of my invention is to insure with greater accuracy than heretofore the adjustment of the flask in the clamp necessary to properly secureit during the several operations of forming the molds, and heating and compressing the celluloid or other plate to which the artificial teeth are attached, and also to facilitate the separation of the two parts of the flask and the male and female molds contained therein, when required, with less liability of fracturing the calcined plaster of which the molds are formed.

In the drawings, Figure 1 is intended to represent a vertical section of my invention, and in which A is the flask, consisting of the conical plate 0, the copef, nowel g,bottom plate, h, and thetwo dowels or guide-pins e e. The flask is represented as being held in the stirrup-like clamp B, having a compressing-screw, d.

Fig. 2 is a transverse sectional view of the flask on the line as :0.

In the ordinary form of flasks the dowels or guide-pins e e are also set and fixed immovahlyin one part of the flask,but are constructed to slide freely through corresponding holes in its counterpart, in order to cause the two parts of the flask to come properly together duringtheprocess ofcompressing; but at the same time, by reason of their fixityand rigidity, the separation of the flask often causes the breakage of the plaster molds contained therein whenever there are depressions or recesses in the molds (which frequently exist) beyond the line of a straight draft.

(No model.)

In my invention the upper plate, 0, of the flask is of conical form, combining strength with lightness, and has a countersunk seat, 1', atits apex to receive the com pression-screw d of the clamp. As the screw d commences to enter the seat i, all the different parts of the flask being locked together, the flask will adjust itself in the clamp B directly and centrally underneath the screw, so that the-compression will be uniform in every part.

My invention also consists in the peculiarlyconstructed dowels or guide-pins e e, which are made with a short threaded screw on an enlarged partot the pin, directly underneath and againstthehead. These piusare screwed firmly into tapped holes through the ears m m or n n of one ofthe partsof the flask. It is immaterial which. The remainderof the pin is of less size by at least twice the depth of the screw, and passes closely and freely through corresponding holes in the other part of the flask.

. When thetwo parts of the flask,fand g,are to be put together the pins 0 c are screwed into place in one of the parts, thus making them fixed dowels, by which the other part of the flask may be properly guided into position.

When it is required to separate the parts of the flask thescrewed dowel-pins e 0 maybe removed,if necessary,in order to permit the two parts'to be slightly turned, tilted, or drawn at different angles to adapt themselves to the particular conformation of the molds within.

What I claim as my invention, and desire to secure by Letters Patent, is.

The combination, in a dental flask, of the threaded-screw dowel or guide pins e c, with the copef, and nowel g, constructed as and for the purposes herein set forth.

THOMAS W. BROWNE.

Witnesses:

JONAS M. PRESTON, JOSEPH ANDERSON. 

